WO1991018215A1 - Self-locking tapping screw - Google Patents

Self-locking tapping screw Download PDF

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Publication number
WO1991018215A1
WO1991018215A1 PCT/EP1991/000873 EP9100873W WO9118215A1 WO 1991018215 A1 WO1991018215 A1 WO 1991018215A1 EP 9100873 W EP9100873 W EP 9100873W WO 9118215 A1 WO9118215 A1 WO 9118215A1
Authority
WO
WIPO (PCT)
Prior art keywords
thread
screw
adhesive coating
forming
adhesive
Prior art date
Application number
PCT/EP1991/000873
Other languages
German (de)
French (fr)
Inventor
Elmar Hangartner
Original Assignee
Sfs Stadler Holding Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19904015772 external-priority patent/DE4015772C1/en
Priority claimed from DE19904015771 external-priority patent/DE4015771A1/en
Application filed by Sfs Stadler Holding Ag filed Critical Sfs Stadler Holding Ag
Priority to EP91909061A priority Critical patent/EP0483318B1/en
Priority to DE59106722T priority patent/DE59106722D1/en
Publication of WO1991018215A1 publication Critical patent/WO1991018215A1/en
Priority to FI920179A priority patent/FI98553C/en
Priority to NO920200A priority patent/NO178352C/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/225—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of a settable material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B33/00—Features common to bolt and nut
    • F16B33/06—Surface treatment of parts furnished with screw-thread, e.g. for preventing seizure or fretting

Definitions

  • the invention relates to a thread-forming screw for screwing into prefabricated holes in a workpiece.
  • thread-forming screws were used, it was previously assumed that the thread shape on the screw and the internal thread formed by the screw itself in the holes in the workpiece provided such a tight fit that additional measures to secure it against loosening would not be necessary.
  • the experts were of the opinion that sealing such screw connections was either not necessary or could not be achieved due to the tolerances between screw thread and internal thread in the workpiece being reduced to practically zero.
  • the object of the invention is therefore to create a thread-forming screw with which the security against loosening can be improved and a tight screw connection can be achieved.
  • the thread-forming screw is provided with an adhesive coating covering at least part of the thread surface.
  • an adhesive coating applied to the thread surface can also be used with thread-forming screws and has an optimal effect.
  • the thread in the holes is produced by the screw itself and the thread flanks of the screw and the internal thread therefore lie snugly against one another, the adhesive coating pulls a microfine film between the screw and the hole wall, so that effective unscrewing security and a tight connection can be guaranteed.
  • Thread-rolling screws according to DIN 7500 have not been used for tight connections so far, and on the other hand screws with adhesive coating according to DIN 267, part 27, have only been used where there are holes in them prefabricated internal thread or corresponding nuts were provided.
  • a prejudice of the professional world had to be overcome in the fastening sector in order to even discuss the possibility of providing adhesive coatings on self-tapping screws.
  • the adhesive coating can in certain cases even behave like a lubricant in order to improve the thread production and reduce the screw-in torque. In any case, care is taken to ensure that an adhesive film is produced on the entire thread surface, at least over a portion of the length of the thread section, which significantly increases the security against loosening for such thread-forming screws and also ensures an optimal sealing of the screw connection.
  • the measures according to the invention are most effective when the thread-forming screw has a non-round, e.g. Trilobular, polygonal or designed in the manner of a constant thickness.
  • the adhesive is then practically accumulated again and again in the areas with a lower thread height and continuously drawn on in the form of a thin film over the entire circumference of the thread.
  • the adhesive coating is applied to the thread area in a strip-like manner, parallel to the axis.
  • the adhesive coating is applied in a plurality of strip-like sections which follow one another at intervals and run parallel to the axis.
  • the adhesive coating is applied to the threaded area in the form of a ring-shaped individual section or in the form of a plurality of ring sections which follow one another in the axial direction at a distance.
  • the adhesive coating in the strip-shaped arrangement is not provided in a circumferentially parallel alignment on a threaded section, is by The special design of the self-tapping screws ensures that a thin film of adhesive is drawn along in the hole in the workpiece during the production of the internal thread and distributed around the circumference.
  • the adhesive coating consist of a microencapsulated adhesive.
  • the thread areas pre-coated with microencapsulated liquid adhesive meet the highest requirements for maintaining the pretensioning force even under dynamic stress transversely to the screw axis.
  • Microencapsulation is a physiochemical process which includes hardening liquid plastic in small capsules. The microcapsules burst when the thread is screwed into the workpiece, thus releasing the liquid plastic and producing an excellent adhesive bond through reaction with the second component, a hardener. It is guaranteed that it will not loosen.
  • the thread-forming screw designed in accordance with the invention is well secured against automatic loosening after only a few hours and seals perfectly against many media.
  • Figure 1 is a thread-forming screw, which is already partially screwed into a hole in a workpiece.
  • Fig. 2 shows enlarged a portion of the thread area of the thread-forming screw.
  • the thread-forming screw 1 consists of a shaft 3 formed with a threaded section 2 and a screw head 4.
  • a hexagon head has been shown here.
  • the measures according to the invention are not only suitable for screws with a hexagon head, but also for all screws with a thread-forming shank section, it also being possible to provide stud screws, that is to say screws without a head, or screws with a wide variety of heads or flanges, depending on the intended use.
  • the thread-forming screw 1 is provided with an adhesive coating 5 covering at least part of the thread surface.
  • This adhesive coating is advantageously formed from a microencapsulated adhesive which can already be applied at the screw production site.
  • Thread-rolling screws generally have a non-circular cross-section, e.g. a trilobular, polygonal or similar thick section.
  • thread-forming screws of this type are also known, which have slots or notches running along their length, that is to say approximately axially parallel, and are therefore likewise to be referred to as thread-forming screws.
  • the adhesive coating 5 can be applied to the thread area of the thread-forming screw 1 in various ways. It is thus possible to apply the adhesive coating in the form of a strip parallel to the thread area, or else it is possible to apply a plurality of sections which follow one another at intervals and are in the form of strips and run parallel to the axis. However, it is also possible to apply the adhesive coating to the threaded area in the form of a ring-shaped individual section or in the form of a plurality of ring sections which follow one another in the axial direction at intervals. Of course, the adhesive coating can also be applied over the entire thread area of the shaft 3 of the thread-forming screw 1. However, it can then happen that there is too much adhesive material, because between the interior thread in the workpiece 6 and the thread of the screw there is practically no play and only a microfine film can be drawn in and thus applied in a circumferentially closed manner.
  • the present invention has thus created the possibility and the effects which result from an adhesive coating of a thread-forming screw have also been recognized. For the first time, therefore, the possibility has been created of anchoring thread-forming screws in a manner that prevents them from unscrewing, and also of optimally sealing this screw connection.
  • the self-tapping screw is screwed into prefabricated holes 7.
  • the holes can e.g. be pre-drilled, pre-cast or pre-punched.
  • the measures according to the invention can also be used in the case of an inverted construction, that is to say if the thread-forming screw has an at least approximate cylindrical shape and the holes 7 in the workpiece 6 are non-circular, e.g. have a trilobular, polygonal or cross-sectional shape.
  • the measures according to the invention are equally suitable for screwing in the self-tapping screws in metal or in plastic. It is also conceivable that simply by screwing the threaded end of a helical metal part into an opening in a plastic injection-molded part in cooperation with the adhesive with which the threaded end of the metal part is coated, such a good connection between What is achieved with the metal part and the plastic injection-molded part is that the component can absorb the torques, bending loads and tensile and compressive forces required for special uses.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dowels (AREA)
  • Connection Of Plates (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Standing Axle, Rod, Or Tube Structures Coupled By Welding, Adhesion, Or Deposition (AREA)
  • Heterocyclic Compounds That Contain Two Or More Ring Oxygen Atoms (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Piles And Underground Anchors (AREA)
  • Materials For Medical Uses (AREA)

Abstract

A tapping screw (1) is screwed into a prefabricated hole (7) in a workpiece (6). The tapping screw (1) is provided with an adhesive layer (5) which covers at least part of the screw surface (2). When a tap is formed by screwing the screw (1) into the hole (7) in the workpiece (6), a thin film of adhesive layer (5) is entrained with the screw, enclosing its circumference, preventing it from working loose and for sealing.

Description

SELBSTSICHERNDE, GEWINDEFURCHENDE SCHRAUBE SELF-LOCKING, THREAD-FORMING SCREW
Die Erfindung betrifft eine gewindefurchende Schraube zum Eindrehen in vorgefertigte Löcher in einem Werkstück. Beim Einsatz gewindefurchender Schrauben ging man bisher davon aus, dass durch die Gewindeform an der Schraube und das von der Schraube selbst in den Lochern des Werkstückes gebildete Innengewinde eine derart enge Passung vorgegeben sei, dass weitere Massnah en zur Sicherung gegen ein Losdrehen nicht erforderlich wären. Ausserde war die Fachwelt der Ansicht, dass eine Abdichtung sol¬ cher Schraubverbindungen infolge der praktisch auf Null reduzierten To¬ leranzen zwischen Schraubengewinde und Innengewinde im Werkstück entwe- der nicht erforderlich oder aber nicht realisierbar sei.The invention relates to a thread-forming screw for screwing into prefabricated holes in a workpiece. When thread-forming screws were used, it was previously assumed that the thread shape on the screw and the internal thread formed by the screw itself in the holes in the workpiece provided such a tight fit that additional measures to secure it against loosening would not be necessary. In addition, the experts were of the opinion that sealing such screw connections was either not necessary or could not be achieved due to the tolerances between screw thread and internal thread in the workpiece being reduced to practically zero.
Die Erfindung hat sich daher zur Aufgabe gestellt, eine gewindefurchende Schraube zu schaffen, mit der die Losdrehsicherheit verbessert werden kann und eine dichte Schraubverbindung erzielbar ist.The object of the invention is therefore to create a thread-forming screw with which the security against loosening can be improved and a tight screw connection can be achieved.
Zur Lösung dieser Aufgabe wird erfindungsgemäss vorgeschlagen, dass die gewindefurchende Schraube mit einer zumindest einen Teil der Gewinde¬ oberfläche bedeckenden Klebstoffbeschichtung versehen ist.To achieve this object, it is proposed according to the invention that the thread-forming screw is provided with an adhesive coating covering at least part of the thread surface.
Es hat sich bei Versuchen gezeigt, dass entgegen der allgemeinen Ansicht der Fachwelt eine auf die Gewindeoberfläche aufgebrachte Klebstoffbe¬ schichtung auch bei gewindefurchenden Schrauben einsetzbar ist und eine optimale Wirkung mit sich bringt. Obwohl das Gewinde in den Löchern durch die Schraube selbst hergestellt wird und die Gewindeflanken von Schraube und Innengewinde demnach satt aneinander anliegen, wird durch die Klebstoffbeschichtung ein mikrofeiner Film zwischen Schraube und Bohrungswandung eingezogen, so dass eine effektive Losdrehsicherheit und eine dichte Verbindung gewährleistet werden kann.It has been shown in tests that contrary to the general view of the specialist world, an adhesive coating applied to the thread surface can also be used with thread-forming screws and has an optimal effect. Although the thread in the holes is produced by the screw itself and the thread flanks of the screw and the internal thread therefore lie snugly against one another, the adhesive coating pulls a microfine film between the screw and the hole wall, so that effective unscrewing security and a tight connection can be guaranteed.
Gewindefurchende Schrauben nach DIN 7500 wurden bisher nicht für dichte Verbindungen eingesetzt, und andererseits wurden Schrauben mit klebender Beschichtung nach DIN 267, Teil 27, nur dort eingesetzt, wo Löcher mit vorgefertigtem Innengewinde bzw. entsprechende Muttern vorgesehen waren. Auf dem Befestigungssektor musste also ein Vorurteil der Fachwelt über¬ wunden werden, um überhaupt die Möglichkeit zu erörtern, auf gewindefur¬ chenden Schrauben klebende Beschichtungen vorzusehen.Thread-rolling screws according to DIN 7500 have not been used for tight connections so far, and on the other hand screws with adhesive coating according to DIN 267, part 27, have only been used where there are holes in them prefabricated internal thread or corresponding nuts were provided. A prejudice of the professional world had to be overcome in the fastening sector in order to even discuss the possibility of providing adhesive coatings on self-tapping screws.
Beim Eindrehen einer gewindefurchenden Schraube kann sich die Klebstoff¬ beschichtung in gewissen Fällen sogar einem Schmiermittel entsprechend verhalten, um dadurch die Gewindeherstellung zu verbessern und das Ein¬ schraubdrehmoment zu verringern. Es ist auf jeden Fall dafür gesorgt, dass auf der gesamten Gewindeoberfläche zumindest über einen Teilbereich der Länge des Gewindeabschnittes ein Klebstofffilm erzeugt wird, der die Losdrehsicherheit für solche gewindefurchenden Schrauben wesentlich er¬ höht und ausserdem eine optimale Abdichtung der Schraubverbindung ge¬ währleistet.When a thread-forming screw is screwed in, the adhesive coating can in certain cases even behave like a lubricant in order to improve the thread production and reduce the screw-in torque. In any case, care is taken to ensure that an adhesive film is produced on the entire thread surface, at least over a portion of the length of the thread section, which significantly increases the security against loosening for such thread-forming screws and also ensures an optimal sealing of the screw connection.
Am wirkungsvollsten sind die erfindungsgemässen Massnah en dann, wenn die gewindefurchende Schraube einen unrunden, z.B. trilobularen, mehr¬ eckigen oder nach Art eines Gleichdicks ausgeführten Querschnitt auf¬ weist. Der Klebstoff wird dann praktisch immer wieder in den mit gerin¬ gerer Gewindehöhe ausgeführten Bereichen angesammelt und ständig in Form eines dünnen Filmes auf den ganzen Gewindeumfang weitergezogen.The measures according to the invention are most effective when the thread-forming screw has a non-round, e.g. Trilobular, polygonal or designed in the manner of a constant thickness. The adhesive is then practically accumulated again and again in the areas with a lower thread height and continuously drawn on in the form of a thin film over the entire circumference of the thread.
Je nach Einsatzzweck einer solchen gewindefurchenden Schraube und je nach dem Material, in welches diese Schraube eingedreht werden soll, be¬ stehen verschiedene Möglichkeiten zum Auftragen der Klebstoffbeschich¬ tung. So ist es denkbar, dass die Klebstoffbeschichtung streifenförmig achsparallel auf den Gewindebereich aufgebracht ist. Es kann aber auch vorgesehen werden, dass die Klebstoffbeschichtung in mehreren, mit Ab¬ stand aufeinander folgenden, streifenförmigen, achsparallel verlaufenden Abschnitten aufgetragen ist.Depending on the intended use of such a thread-forming screw and on the material into which this screw is to be screwed in, there are various options for applying the adhesive coating. It is conceivable that the adhesive coating is applied to the thread area in a strip-like manner, parallel to the axis. However, it can also be provided that the adhesive coating is applied in a plurality of strip-like sections which follow one another at intervals and run parallel to the axis.
Eine weitere Variante ist darin gelegen, dass die Klebstoffbeschichtung in Form eines ringförmigen Einzelabschnittes oder in Form mehrerer, in axialer Richtung mit Abstand aufeinander folgender Ringabschnitte auf den Gewindebereich aufgebracht ist. Obwohl die Klebstoffbeschichtung in der streifenförmigen Anordnung in achsparalleler Ausrichtung nicht um- fangsgeschlossen auf einem Gewindeabschnitt vorgesehen ist, wird durch die besondere Ausbildung der gewindefurchenden Schrauben gewährleistet, dass bei der Herstellung des Innengewindes im Loch des Werkstückes ein dünner Film von Klebstoff mitgezogen und umfangsgeschlossen verteilt wird.Another variant is that the adhesive coating is applied to the threaded area in the form of a ring-shaped individual section or in the form of a plurality of ring sections which follow one another in the axial direction at a distance. Although the adhesive coating in the strip-shaped arrangement is not provided in a circumferentially parallel alignment on a threaded section, is by The special design of the self-tapping screws ensures that a thin film of adhesive is drawn along in the hole in the workpiece during the production of the internal thread and distributed around the circumference.
Weiters wird vorgeschlagen, dass die Klebstoffbeschichtung aus einem mi- kroverkapselten Klebstoff besteht. Zur Sicherung und Dichtung von Schraubverbindungen zwischen einer gewindefurchenden Schraube und dem in ein Loch eines Werkstückes eingefurchten Gewinde erfüllen die mit mikro- verkapselte Flüssigkleber vorbeschichteten Gewindebereiche höchste An- forderungen zur Erhaltung der Vorspannkraft auch unter dynamischer Bean¬ spruchung quer zur Schraubenachse. Die Mikroverkapselung ist ein physi¬ kalisch-chemisches Verfahren, welches aushärtenden Flüssigkunststoff in kleinen Kapseln einschliesst. Beim Einschrauben und somit beim Einfur¬ chen des Gewindes im Werkstück platzen die Mikrokapseln auf, wodurch der Flüssigkunststoff freigesetzt wird und durch Reaktion mit der zweiten Komponente, einem Härter, eine ausgezeichnete Klebverbindung entsteht. Es wird somit die Losdrehsicherheit garantiert. Die erfindungsgemäss ausgebildete, gewindefurchende Schraube ist bereits nach wenigen Stunden gegen selbsttätiges Lösen gut gesichert und dichtet gegen viele Medien einwandfrei ab.It is also proposed that the adhesive coating consist of a microencapsulated adhesive. To secure and seal screw connections between a thread-forming screw and the thread grooved into a hole in a workpiece, the thread areas pre-coated with microencapsulated liquid adhesive meet the highest requirements for maintaining the pretensioning force even under dynamic stress transversely to the screw axis. Microencapsulation is a physiochemical process which includes hardening liquid plastic in small capsules. The microcapsules burst when the thread is screwed into the workpiece, thus releasing the liquid plastic and producing an excellent adhesive bond through reaction with the second component, a hardener. It is guaranteed that it will not loosen. The thread-forming screw designed in accordance with the invention is well secured against automatic loosening after only a few hours and seals perfectly against many media.
Es ist im Rahmen der Erfindung durchaus möglich, andere Klebstoffbe- schichtungen vorzusehen, insbesondere können auch flüssige Klebstoffe unmittelbar vor dem Eindrehen der Schraube aufgebracht werden, doch ist gerade mit der Klebstoffbeschichtung in Form ikroverkapselten Klebstof- fes eine optimale Fertigbearbeitung der Schrauben mit langer Lagerfähig¬ keit vor dem Eindrehen gewährleistet.It is entirely possible within the scope of the invention to provide other adhesive coatings, in particular liquid adhesives can also be applied immediately before the screw is screwed in, but it is precisely with the adhesive coating in the form of microencapsulated adhesive that the screws can be optimally finished with a long shelf life guaranteed before screwing in.
Weitere erfindungsge ässe Merkmale und besondere Vorteile werden in der nachstehenden Beschreibung anhand der Zeichnung noch näher erläutert. Es zeigen:Further features of the invention and particular advantages are explained in more detail in the following description with reference to the drawing. Show it:
Fig. 1 eine gewindefurchende Schraube, welche bereits zum Teil in ein Loch eines Werkstückes eingedreht ist; Fig. 2 vergrössert dargestellt einen Teilabschnitt des Gewindebereiches der gewindefurchenden Schraube.Figure 1 is a thread-forming screw, which is already partially screwed into a hole in a workpiece. Fig. 2 shows enlarged a portion of the thread area of the thread-forming screw.
Die gewindefurchende Schraube 1 besteht aus einem mit einem Gewindeab¬ schnitt 2 ausgebildeten Schaft 3 und einem Schraubenkopf 4. Es wurde hier ein Sechskantkopf dargestellt. Die erfindungsgemässen Massnahmen eignen sich aber nicht nur auf Schrauben mit Sechskantkopf, sondern auf alle Schrauben mit gewindefurchendem Schaftabschnitt, wobei auch Stift¬ schrauben, also Schrauben ohne Kopf, oder aber Schrauben mit verschie¬ densten Köpfen oder Flanschen je nach Einsatzzweck vorgesehen werden können.The thread-forming screw 1 consists of a shaft 3 formed with a threaded section 2 and a screw head 4. A hexagon head has been shown here. However, the measures according to the invention are not only suitable for screws with a hexagon head, but also for all screws with a thread-forming shank section, it also being possible to provide stud screws, that is to say screws without a head, or screws with a wide variety of heads or flanges, depending on the intended use.
Die gewindefurchende Schraube 1 ist mit einer zumindest einen Teil der Gewindeoberfläche bedeckenden Klebstoffbeschichtung 5 versehen. Vorteil¬ haft ist diese Klebstoffbeschichtung aus einem mikroverkapselten Kleb¬ stoff gebildet, welcher bereits an der Fertigungsstätte der Schraube aufgebracht werden kann.The thread-forming screw 1 is provided with an adhesive coating 5 covering at least part of the thread surface. This adhesive coating is advantageously formed from a microencapsulated adhesive which can already be applied at the screw production site.
Gewindefurchende Schrauben weisen in der Regel einen unrunden Quer¬ schnitt, z.B. einen trilobularen, mehreckigen oder nach Art eines Gleichdicks ausgeführten Querschnitt, auf. Es sind aber auch gewindefur¬ chende Schrauben dieser Art bekannt, welche über deren Länge, also annä- hernd achsparallel verlaufende Schlitze oder Einkerbungen aufweisen und somit ebenfalls als gewindefurchende Schrauben zu bezeichnen sind.Thread-rolling screws generally have a non-circular cross-section, e.g. a trilobular, polygonal or similar thick section. However, thread-forming screws of this type are also known, which have slots or notches running along their length, that is to say approximately axially parallel, and are therefore likewise to be referred to as thread-forming screws.
Die Klebstoffbeschichtung 5 kann auf verschiedene Art und Weise auf den Gewindebereich der gewindefurchenden Schraube 1 aufgebracht werden. So ist es möglich, die Klebstoffbeschichtung streifenförmig achsparallel auf den Gewindebereich aufzubringen oder aber es können mehrere, mit Ab¬ stand aufeinander folgende, streifenformige und achsparallel verlaufende Abschnitte aufgetragen werden. Es ist aber auch möglich, die Klebstoff¬ beschichtung in Form eines ringförmigen Einzelabschnittes oder in Form mehrerer, in axialer Richtung mit Abstand aufeinander folgender Ringab- schnitte auf den Gewindebereich aufzubringen. Natürlich kann die Kleb¬ stoffbeschichtung auch über den ganzen Gewindebereich des Schaftes 3 der gewindefurchenden Schraube 1 aufgetragen werden. Es kann dann aber vor¬ kommen, dass zuviel Klebstoffmaterial vorhanden ist, da zwischen dem In- nengewinde im Werkstück 6 und dem Gewinde der Schraube praktisch kein Spiel vorhanden ist und nur ein mikrofeiner Film miteingezogen und somit umfangsgeschlossen aufgetragen werden kann.The adhesive coating 5 can be applied to the thread area of the thread-forming screw 1 in various ways. It is thus possible to apply the adhesive coating in the form of a strip parallel to the thread area, or else it is possible to apply a plurality of sections which follow one another at intervals and are in the form of strips and run parallel to the axis. However, it is also possible to apply the adhesive coating to the threaded area in the form of a ring-shaped individual section or in the form of a plurality of ring sections which follow one another in the axial direction at intervals. Of course, the adhesive coating can also be applied over the entire thread area of the shaft 3 of the thread-forming screw 1. However, it can then happen that there is too much adhesive material, because between the interior thread in the workpiece 6 and the thread of the screw there is practically no play and only a microfine film can be drawn in and thus applied in a circumferentially closed manner.
Durch die vorliegende Erfindung ist also die Möglichkeit geschaffen wor- den und es sind auch die Wirkungen erkannt worden, die sich bei einer Klebstoffbeschichtung einer gewindefurchenden Schraube ergeben. Es ist daher erstmals die Möglichkeit geschaffen worden, gewindefurchende Schrauben entsprechend losdrehsicher zu verankern und ferner diese Schraubverbindung optimal abzudichten.The present invention has thus created the possibility and the effects which result from an adhesive coating of a thread-forming screw have also been recognized. For the first time, therefore, the possibility has been created of anchoring thread-forming screws in a manner that prevents them from unscrewing, and also of optimally sealing this screw connection.
Die gewindefurchende Schraube wird in vorgefertigte Löcher 7 eingedreht. Die Löcher können also z.B. vorgebohrt, vorgegossen oder vorgestanzt sein.The self-tapping screw is screwed into prefabricated holes 7. The holes can e.g. be pre-drilled, pre-cast or pre-punched.
Die erfindungsgemässen Massnahmen sind auch bei umgekehrter Konstruktion einsetzbar, also wenn die gewindefurchende Schraube eine zumindest annä- hernde Zylinderform aufweist und die Löcher 7 im Werkstück 6 eine unrun¬ de, z.B. eine trilobulare, mehreckige oder nach Art eines Gleichdicks ausgeführte Querschnittsform haben.The measures according to the invention can also be used in the case of an inverted construction, that is to say if the thread-forming screw has an at least approximate cylindrical shape and the holes 7 in the workpiece 6 are non-circular, e.g. have a trilobular, polygonal or cross-sectional shape.
Die erfindungsgemässen Massnahmen eignen sich gleichermassen beim Ein¬ drehen der gewindefurchenden Schrauben in Metall oder in Kunststoff. So ist es auch denkbar, dass allein durch das Eindrehen des Gewindeendes eines schraubenförmigen Metallteils in eine Oeffnung in einem Kunst¬ stoff-Spritzteil im Zusammenwirken mit dem Klebstoff, mit dem das Gewin¬ deende des Metallteils beschichtet ist, eine derart gute Verbindung zwi¬ schen dem Metallteil und dem Kunststoff-Spritzteil erzielt wird, dass der Bauteil die für spezielle Einsätze erforderlichen Drehmomente, Bie¬ gebelastungen sowie Zug- und Druckkräfte aufnehmen kann. The measures according to the invention are equally suitable for screwing in the self-tapping screws in metal or in plastic. It is also conceivable that simply by screwing the threaded end of a helical metal part into an opening in a plastic injection-molded part in cooperation with the adhesive with which the threaded end of the metal part is coated, such a good connection between What is achieved with the metal part and the plastic injection-molded part is that the component can absorb the torques, bending loads and tensile and compressive forces required for special uses.

Claims

Patentansprüche Claims
1. Gewindefurchende Schraube zum Eindrehen in vorgefertigte Löcher in einem Werkstück, dadurch gekennzeichnet, dass die gewindefurchende Schraube (1) mit einer zumindest einen Teil der Gewindeoberfläche (2) bedeckenden Klebstoffbeschichtung (5) versehen ist.1. Thread-forming screw for screwing into prefabricated holes in a workpiece, characterized in that the thread-forming screw (1) is provided with an adhesive coating (5) covering at least part of the thread surface (2).
2. Schraube nach Anspruch 1, dadurch gekennzeichnet, dass die gewinde¬ furchende Schraube (1) einen unrunden, z.B. trilobularen, mehreckigen oder nach Art eines Gleichdicks ausgeführten Querschnitt aufweist.2. Screw according to claim 1, characterized in that the thread-forming screw (1) has a non-circular, e.g. trilobular, polygonal or designed in the manner of a constant thickness.
3. Schraube nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, dass die Klebstoffbeschichtung (5) streifenförmig achsparallel auf den Ge- windebereich (2) aufgebracht ist.3. Screw according to claims 1 or 2, characterized in that the adhesive coating (5) is applied in a strip-like manner axially parallel to the threaded area (2).
4. Schraube nach Anspruch 3, dadurch gekennzeichnet, dass die Klebstoff¬ beschichtung (5) in mehreren, mit Abstand aufeinander folgenden, streifenförmigen, achsparallel verlaufenden Abschnitten aufgetragen ist.4. Screw according to claim 3, characterized in that the adhesive coating (5) is applied in several, successively spaced, strip-shaped, axially parallel sections.
5. Schraube nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, dass die Klebstoffbeschichtung (5) in Form eines ringförmigen Einzelab¬ schnittes oder in Form mehrerer, in axialer Richtung mit Abstand auf¬ einander folgender Ringabschnitte auf den Gewindebereich aufgebracht ist.5. Screw according to claims 1 or 2, characterized in that the adhesive coating (5) is applied in the form of an annular single section or in the form of a plurality of ring sections which follow one another in the axial direction at a distance from one another on the threaded region.
6. Schraube nach Anspruch 1 und einem der vorhergehenden Ansprüche, da¬ durch gekennzeichnet, dass die Klebstoffbeschichtung (5) aus einem mikroverkapselten Klebstoff besteht. 6. Screw according to claim 1 and one of the preceding claims, characterized in that the adhesive coating (5) consists of a microencapsulated adhesive.
PCT/EP1991/000873 1990-05-16 1991-05-10 Self-locking tapping screw WO1991018215A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP91909061A EP0483318B1 (en) 1990-05-16 1991-05-10 Self-locking tapping screw
DE59106722T DE59106722D1 (en) 1990-05-16 1991-05-10 SELF-LOCKING, THREAD-FORMING SCREW.
FI920179A FI98553C (en) 1990-05-16 1992-01-15 Screw-cutting screw
NO920200A NO178352C (en) 1990-05-16 1992-01-15 Self-tapping screw

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19904015772 DE4015772C1 (en) 1990-05-16 1990-05-16 High torque transmission coupling - has injection moulded plastics section and threaded axial metal section
DE19904015771 DE4015771A1 (en) 1990-05-16 1990-05-16 Thread-forming screw system - has adhesive coating over at least part of its thread, with non-round cross section
DEP4015772.5 1990-05-16
DEP4015771.7 1990-05-16

Publications (1)

Publication Number Publication Date
WO1991018215A1 true WO1991018215A1 (en) 1991-11-28

Family

ID=25893272

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1991/000873 WO1991018215A1 (en) 1990-05-16 1991-05-10 Self-locking tapping screw

Country Status (8)

Country Link
EP (1) EP0483318B1 (en)
JP (1) JPH04507451A (en)
AT (1) ATE129321T1 (en)
DE (1) DE59106722D1 (en)
ES (1) ES2080946T3 (en)
FI (1) FI98553C (en)
NO (1) NO178352C (en)
WO (1) WO1991018215A1 (en)

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DE4218975A1 (en) * 1992-06-10 1993-12-16 Rexroth Mannesmann Gmbh Housing used as component of hydraulic appts.
US5482348A (en) * 1993-07-12 1996-01-09 Ford Motor Company Vehicle hood support post member
US5853841A (en) * 1996-01-20 1998-12-29 Itw Befestigungssysteme Gmbh Fastener assembly for a high-strength connection to a substructure
DE29921235U1 (en) * 1999-12-02 2001-04-05 Delo Industrieklebstoffe Gmbh Fastening arrangement for solid building materials
EP1111252A3 (en) * 1999-12-20 2002-07-24 TEXTRON Verbindungstechnik GmbH & Co. oHG Fastener assembly
WO2007057147A1 (en) * 2005-11-15 2007-05-24 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Disk brake, in particular for a utility vehicle
WO2010083916A1 (en) * 2009-01-23 2010-07-29 Fritz Egger Gmbh & Co. Og Fastening arrangement for mounting a wall shelf
WO2020108708A1 (en) * 2018-11-28 2020-06-04 Springfix Befestigungstechnik Gmbh Device for securing to at least one component

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JP4714370B2 (en) * 2001-05-30 2011-06-29 積水化学工業株式会社 Mounting structure and mounting method of outer wall support bar
DE102008033173A1 (en) 2008-07-15 2010-02-04 Fujitsu Siemens Computers Gmbh Fastening arrangement for a safety module and use of a screw for fastening a safety module
DE102008045412A1 (en) 2008-09-02 2010-03-04 Sfs Intec Holding Ag Screw and thus established connection between a profile and an outer wall
CN111043120A (en) * 2019-12-30 2020-04-21 西北工业大学 High-temperature-resistant bolt gluing anti-loose gluing bonding method

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4218975A1 (en) * 1992-06-10 1993-12-16 Rexroth Mannesmann Gmbh Housing used as component of hydraulic appts.
DE4218975C3 (en) * 1992-06-10 1998-07-09 Rexroth Mannesmann Gmbh Housing provided in particular as part of a hydraulic device
US5482348A (en) * 1993-07-12 1996-01-09 Ford Motor Company Vehicle hood support post member
US5853841A (en) * 1996-01-20 1998-12-29 Itw Befestigungssysteme Gmbh Fastener assembly for a high-strength connection to a substructure
DE29921235U1 (en) * 1999-12-02 2001-04-05 Delo Industrieklebstoffe Gmbh Fastening arrangement for solid building materials
EP1111252A3 (en) * 1999-12-20 2002-07-24 TEXTRON Verbindungstechnik GmbH & Co. oHG Fastener assembly
WO2007057147A1 (en) * 2005-11-15 2007-05-24 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Disk brake, in particular for a utility vehicle
WO2010083916A1 (en) * 2009-01-23 2010-07-29 Fritz Egger Gmbh & Co. Og Fastening arrangement for mounting a wall shelf
WO2020108708A1 (en) * 2018-11-28 2020-06-04 Springfix Befestigungstechnik Gmbh Device for securing to at least one component
DE102018220499B4 (en) 2018-11-28 2024-02-15 Springfix Befestigungstechnik Gmbh Device for fixing to at least one component

Also Published As

Publication number Publication date
NO920200D0 (en) 1992-01-15
FI98553B (en) 1997-03-27
NO920200L (en) 1992-01-15
FI98553C (en) 1997-07-10
NO178352C (en) 1996-03-06
EP0483318B1 (en) 1995-10-18
DE59106722D1 (en) 1995-11-23
EP0483318A1 (en) 1992-05-06
ATE129321T1 (en) 1995-11-15
FI920179A0 (en) 1992-01-15
ES2080946T3 (en) 1996-02-16
NO178352B (en) 1995-11-27
JPH04507451A (en) 1992-12-24

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